Retailer in Go reminiscence like localStorage Javascript? – Getting Assist

I’ve a semi-static menu that ought to load from a database.

To make the load of menu quicker I ponder if there’s a technique to retailer this menus as some sort of world variables? Persistent or not.

You solely have to create a struct to map your knowledge. Additionally you should utilize a common cache library like GitHub – patrickmn/go-cache: An in-memory key:worth retailer/cache (much like Memcached) library for Go, appropriate for single-machine functions.

I don’t suppose you want an exterior dependency for one thing this easy. Create a worldwide variable of some type, guard it with a mutex so it’s thread-safe, then replace it primarily based on some form of interval. One thing like:

// AppMenu shops the worldwide app menu gadgets
sort AppMenu struct {
	Objects []string
}

var (
	muAppMenu  = &sync.RWMutex{} // Guards `appMenu`.
	appMenu   AppMenu 
)

// GetAppMenu returns the present app menu.
func GetAppMenu() AppMenu {
	muAppMenu.RLock()
	menu := appMenu
	muAppMenu.RUnlock()
	return menu
}

// SetAppMenu units the app menu.
func SetAppMenu(menu AppMenu) {
	muAppMenu.Lock()
	appMenu = menu
	muAppMenu.Unlock()
}

You might then someplace in your predominant operate spin up a goroutine to replace your menu merchandise property periodically:

// Context for our goroutine
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// Spin up goroutine to replace app menu gadgets each 30 seconds
go func() {
	t := time.NewTicker(30 * time.Second)
	defer t.Cease()
	for {
		choose {
		case <-ctx.Carried out():
			return // exit goroutine
		case <-t.C:
			menuItems := getMenuItemsFromDBOrWhatever()
			SetAppMenu(menuItems)
		}
	}
}()

Once more, you COULD add a dependency, however I don’t suppose you want one. Additionally observe that you’d presumably have to populate the menu as soon as earlier than the ticker’s first tick. For extra particulars as to why:

I do hope I can keep away from dependencies. However there isn’t any want for redraw AFIAK. The menu must be static and tailor-made dynamically for every person. My aim is to interchange this Javascript code with Go if potential. Transfer this menu creation from browser to Go (Go templates) as a substitute